loginservlet.java

java写的一个简单的bbs系统

package com.ibm.control;

import java.io.IOException;

import java.sql.Connection;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

import com.ibm.common.DBConnection;
import com.ibm.dao.UsersDAO;
import com.ibm.vo.UsersVO;

public class LoginServlet extends HttpServlet {


	private Connection con;


	public void doGet(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {
       
		String username=request.getParameter("username");
		String password=request.getParameter("password");
		
		//获得数据库连接
		con=DBConnection.getInstance().getConnection();
		
		//实现登录功能
		UsersVO uvo=new UsersVO();
//		UsersVO uvo=UsersVO.getInstance();
		UsersDAO usersdao=new UsersDAO();
		uvo=usersdao.queryUser(con, username, password);
		//给session赋值，为了验证用户是否合法
		HttpSession session = request.getSession(true);
		session.setAttribute("uvo", uvo);
		
		
		
		
		if(uvo != null)
		{
		    response.sendRedirect("index.jsp");
		    System.out.println("登录成功");
		  
		}else
		{
			response.sendRedirect("login.jsp");
			System.out.println("登录失败");
		}

	}

	
	public void doPost(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {
         this.doGet(request, response);
	}

}